如果X/2=Y/3=Z/4,那么(2X-Y+3X)/(X+Y-Z)=________.
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于
如果,根号x-3+| y-2 |+z^2=2z-1 求 (x+z)^y
y=-2X,Z=3y,那么X-Y+(-Z)等于
x/2=y/3=z/5 x+3y-z/x-3y+z
如果y=3x,z=2(y-1),那么x-y+z等于( )
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
如果3y=x+2y,那么x *x+9*y*y+4*z*z-6xy-12yz+4xz的值是多少?
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
如果{x+2y-8z=0 2x-3y+5z=0,其中xyz不等于零,那么x+y/z=